Upset my friend didn't wish me a happy birthday

delete his number

Really? Why do you think that?

Sounds like there's an elephant in the room that needs addressing between you and your friend. Did you talk to him about why he stood you up?

Also, Happy Birthday! I know it's late but I hope it was decent at the very least.

Maybe he found someone else at uni and knows you fancy him so he feels awkward talking to you. Or he could just be stressed/busy. Try talking to him again until you figure out the situation

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The fact that he's been off over the last few days suggests that either there's something on his mind that's been distracting him, or he doesn't really want to continue the friendship. Message him and ask if everything's okay and that you're here for him if he needs to talk. If he's still not interested then forget him and move on.

No, he just said that he was suddenly busy, even though he picked that day specifically because he said, and I quote: "I've really not got much going on on Saturday, so it's the best day for me ". That's why I was annoyed, honestly.
I know I need to talk to him but I just don't know how to start the conversation without sounding like an overthinking psycho :/

Thank you! I had a really great day, went out with my friends which was really nice

It'd be annoying if he'd just throw away a 5 year friendship because of basically nothing. If it was something major, I would know, right?? Thanks for the advice though, I do need to talk to him - I'll just struggle with knowing what to say/how to say it

Why would he be throwing it away? he didnt say Happy Birthday, thats it. He could be distracted at the moment. Just ask him if its bothering you that much. You need to be careful he doesnt thnk you are overreacting.

No, this is because he didn't talk to me for 4 weeks, then was rude and abrupt when I tried to talk to him. The lack of a happy birthday wish was just the icing on the cake.
(Read the entirety of the OP, it's all there)

(Backstory - you can skip this if you want: I've known my friend for about 4/5 years now - I was best friends with his sister first, and then we got closer so I'm now actually closer to him than I am to his sister. I've liked him for a while (3 years, maybe?) but nothing's ever happened so I just assumed it would never be a thing. Anyways, last summer things progressed and I got the sense that he was finally seeing me in a new light - i.e. not just as a friend. There was a lot of flirting and we spent more time together than we did apart.
After summer I didn't see him for about 5 months because he went off to uni, but we continued to message each other on a regular basis. I was the one who initially suggested a meet-up, and he agreed so we met up and had a nice chat + food. After that, he asked me out for another meet up type thing, which I agreed to until he cancelled on me at the last minute with pretty much no explanation. Naturally, I was upset but after that, we didn't speak much for a bit. He used to be the main initiator of conversations, but he just didn't bother for a good 3/4 weeks. I then messaged him a few days ago and he was quite cold and not his usual self - I'm not sure what to make of this.)

thought you were gay for a second but then found out you were a girl jeez

Why would it be a problem if I was gay?
Yes, I'm a girl but why would it be a problem if I was a gay guy?

I didn't say it would be a problem